ossify
1. [ verb ] become bony
Examples:

"The tissue ossified"

Related terms: change_state ossification
2. [ verb ] make rigid and set into a conventional pattern
Synonyms: petrify rigidify
Examples:

"rigidify the training schedule" "ossified teaching methods" "slogans petrify our thinking"

Related terms: stiffen ossification inflexibility
3. [ verb ] cause to become hard and bony
Examples:

"The disease ossified the tissue"

Related terms: change ossification
Similar spelling:   Osby